Bag and baggage ( তল্পিতল্পাসহ ) He left the place bag and baggage.
At all ( আদৌ ) He does not know French at all.
By leaps and bounds ( অতি দ্রুতগতিতে ) The population of Bangladesh is increasing by leaps and bounds.
A blessing in disguise ( বিপরীতে হিত ; প্রথমে খারাপ হিসেবে মনে হলেও পরবর্তীতে ভালো হয় ) Sam's motorcycle accident was a blessing in disguise because he got enough insurance money.
By all means ( সবর্প্রকার ) Try to do it by all means.